7daymemoryshop is committed to good customer service,please contact me if have any questions.all my memory is 100% genuine not china fakes.my used cards are formatted and checked with h2testw prior to dispatch.if you are not happy with any of my products,i offer a 30 day return policy,replacement if available or full refund. IF YOU BUY MORE THAN ONE OF MY ITEMS A 20% DISCOUNT WILL BE REFUNDED IMMEDIATELY.